jc-importer / class / EventHandler.php

EventHandler.php in Import WP – CSV & XML Import Export for WordPress trunk, at class/EventHandler.php

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1	<?php
2
3	namespace ImportWP;
4
5	class EventHandler
6	{
7
8	/**
9	* List of stored events
10	*
11	* @var array $events
12	*/
13	private $events;
14
15	/**
16	* Trigger event
17	*
18	* @param string $event
19	* @param array $args
20	*
21	* @return mixed
22	*/
23	public function run($event, $orignal_args = array())
24	{
25	$is_empty = false;
26	if (empty($orignal_args)) {
27	$is_empty = true;
28	} else {
29	$result = array_shift($orignal_args);
30	}
31
32	if (isset($this->events[$event]) && is_array($this->events[$event]) && !empty($this->events[$event])) {
33	foreach ($this->events[$event] as $callback) {
34
35	if (true === $is_empty) {
36	$args = [];
37	} else {
38	$args = array_merge([$result], $orignal_args);
39	}
40
41	$result = call_user_func_array($callback, (array) $args);
42	}
43	}
44
45	return $result;
46	}
47
48	/**
49	* Add event
50	*
51	* @param string $event
52	* @param $callback
53	*/
54	public function listen($event, $callback)
55	{
56
57	if (!isset($this->events[$event])) {
58	$this->events[$event] = array();
59	}
60
61	$this->events[$event][] = $callback;
62	}
63
64	/**
65	* Remove event
66	*
67	* @param string $event
68	* @param $callback
69	*/
70	public function unlisten($event, $callback)
71	{
72	if (isset($this->events[$event]) && in_array($callback, $this->events[$event], true)) {
73
74	if (($key = array_search($callback, $this->events[$event])) !== false) {
75	unset($this->events[$event][$key]);
76	}
77
78	if (empty($this->events[$event])) {
79	unset($this->events[$event]);
80	}
81	}
82	}
83	}
84